Re: [gentoo-hardened] ipv6 on by default for hardened profile

[Anthony G. Basile]

On 06/25/2012 11:03 PM, Alex Efros wrote:
> Hi!
>
> On Mon, Jun 25, 2012 at 08:58:49AM -0500, Matthew Thode wrote:
>>> I'm alerting users so that you can make whatever changes you like to
>>> ipv6 in your /etc/make.conf.  In about 24 hours I will turn on by
>>> default ipv6 on all hardened profiles.
>> I use ipv6 on all my servers (not that everyone does).  We will have to
>> enable it eventually, sooner is probably better then later I think.
>
> Correct me if I'm wrong, but enabling IPv6 mean needs in supporting two
> different routing tables and two different firewalls. Also, I suppose
> enabling IPv6 on any server/router with non-trivial IPv4 firewall rules
> may (and probably will!) result in creating new security holes until admin
> will develop IPv6 firewall rules similar to existing IPv4 firewall rules.
> And I suppose just trying to duplicate existing rules as is won't be
> enough because of new IPv6-specific features, which is absent in IPv4,
> and which should be additionally blocked/enabled too.
>
> If I'm right (about creating new security holes because of enabling ipv6
> USE flag) then it may be bad idea to enable it by default until we'll be
> sure admin is ready for this (for example, we may check is IPv6 enabled in
> kernel and is there exists IPv6 firewall rules).
>
> BTW, is there exists (Gentoo?) guides/howtos which explain these issues
> (preferably from "differences from IPv4" point of view) to average admin
> who know how to setup IPv4 and know nothing about IPv6, and provide
> minimum recommended configuration for IPv6 routing/firewall? I think
> enabling IPv6 by default should begins from writing such docs.
>

Please opt out.  USE="-ipv6" in /etc/make.conf

-- 
Anthony G. Basile, Ph. D.
Chair of Information Technology
D'Youville College
Buffalo, NY 14201
[phone]